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1. Sender's Details: Full name, address, and customer number of the complainant

2. Recipient's Details: Energy company's name, address, and department (if known)

3. Date and Reference Numbers: Current date and relevant reference numbers (customer ID, contract number, bill number)

4. Subject Line: Clear indication that this is a formal complaint about overcharging

5. Bill Identification: Specific details of the contested bill including date and amount

6. Description of Error: Clear explanation of why the bill is believed to be incorrect

7. Legal Basis: Reference to relevant German energy laws and consumer rights

8. Specific Demand: Clear statement of requested correction and refund amount

9. Response Timeline: Specification of expected response timeframe

10. Closing: Professional closing and signature

1. Copy of Disputed Bill: Attachment of the electricity bill being disputed

2. Historical Bills: Copies of previous bills showing normal consumption patterns

3. Meter Reading Photos: If available, photographic evidence of meter readings

4. Proof of Payment: Documentation of any payments made towards the disputed bill

5. Previous Correspondence: Copies of any relevant previous communications with the utility company

6. Expert Assessment: If obtained, any technical evaluation of the billing or meter issue